摘要
基于某矿一采区工作面巷道应力集中程度较高、具有煤岩突出危险征兆等问题,以该矿1303工作面运输平巷应力集中区为研究对象。通过数值模拟分析钻孔直径依次为50、75、108、120 mm时;钻孔深度依次为10、20、30 m时,以及钻孔间距依次为3、5、8 m等条件下的卸压效果,对比模拟结果表明:卸压效果与钻孔直径呈正相关,与钻孔间距呈负相关,即钻孔直径越大,钻孔间距越小,钻孔深度适中,卸压效果会越好。通过分析研究并结合现场地质条件,最终确定该工作面优化后的卸压解围参数为钻孔直径110 mm,钻孔间距5 m,钻孔深度20 m,该卸压解围参数在该矿1303工作面钻孔卸压实践中取得了良好的效果。
Based on the issues of high degree roadway stress concentration of a colliery in the first mining area and the signs of coal rock outburst danger,taking stress concentration of 1303 working face haulage roadway as research object,we simulate the hole diameters of 50,75,108,120 mm,the pressure relief impact of different drilling depth of 10,20,30,40 m,different borehole spacing of3,5,8 m. The simulation showed that the larger the hole diameter was,the smaller the pressure relief hole spacing was; the more moderate the hole depth was,the better the effect would be. Through comparative analysis and combining the field conditions,the hole of 108 mm diameter,5 m spacing,20 m depth was finally recommended as advanced pressure relief drilling parameters. The good results of 1303 working face incolliery were achieved.
出处
《煤矿安全》
CAS
北大核心
2016年第4期191-194,共4页
Safety in Coal Mines
关键词
卸压效果
大直径钻孔
冲击地压
数值模拟
钻屑法
pressure relief effect
large diameter borehole
rock burst
numerical simulation
drilling bits method
